Revert of Deprecate native and extension notification delegates.

chrome/browser/notifications/notification_common.h

Index: chrome/browser/notifications/notification_common.h
diff --git a/chrome/browser/notifications/notification_common.h b/chrome/browser/notifications/notification_common.h
index 1aab89eb711babed40e5954689ec889198334178..9bf8d48a364e1c968c40b655abe8785ef19071d1 100644
--- a/chrome/browser/notifications/notification_common.h
+++ b/chrome/browser/notifications/notification_common.h
@@ -5,21 +5,9 @@
 #ifndef CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_COMMON_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_COMMON_H_
 
-#include "base/feature_list.h"
-
-namespace features {
-
-// TODO(miguelg) We can probably get rid of this altogether.
-extern const base::Feature kAllowFullscreenWebNotificationsFeature;
-
-}  // namespace features
-
 namespace content {
 class BrowserContext;
 }  // namespace content
-
-class GURL;
-class Profile;
 
 // Shared functionality for both in page and persistent notification
 class NotificationCommon {
@@ -47,10 +35,6 @@
   // is updated.
   static void OpenNotificationSettings(
       content::BrowserContext* browser_context);
-
-  // Whether a web notification should be displayed when chrome is in full
-  // screen mode.
-  static bool ShouldDisplayOnFullScreen(Profile* profile, const GURL& origin);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_COMMON_H_